Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the carrots and parsnip, then slice them into uniform 1-inch rounds or cubes to ensure they cook at the same rate.
Place the chicken breast in the center of the baking sheet and arrange the chopped vegetables in a single layer around the meat.
In a small bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Drizzle the herb-infused oil over the chicken and vegetables, using your hands or a brush to coat everything thoroughly.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices stay locked in.